22 



RANGE IMPROVEMENT IN ARIZONA, 



very marked. Chloris elegans, which commonly grows 2 feet high, 

 may be often found on the drier mesas in scattering specimens matur- 

 ing perfect seed when the whole plant above ground measures no 

 more than an inch and a quarter in length. Six-weeks grama {Boute- 

 loua aristidoides) is often reduced from the maximum of 12 inches in 



\ :-^ 



teight, with a dozen or more branches, to a single culm three-fourths 

 cf an inch long, maturing but one or two spikelets. Corresponding 

 variations in size are especiall}^ noticeable in all of the annual 

 species. 



The mountain range presents a very characteristic appearance. 



